I think in the hypothetical scenario of a magically self sustaining portal that seemingly generates its own energy to keep active, energy would be applied to the people via the portal
This still assumes that the portal is an infinite-energy machine, though, which I think is unwarranted and creates more difficulty than is necessary. I would assume that the portal itself has no properties and does not act on other objects.
I think in the hypothetical scenario of a magically self sustaining portal that seemingly generates its own energy to keep active, energy would be applied to the people via the portal
This still assumes that the portal is an infinite-energy machine, though, which I think is unwarranted and creates more difficulty than is necessary. I would assume that the portal itself has no properties and does not act on other objects.